Rotaby steam-engine



UNITED sTATEs PATENT oEEroE. N

ROYAL C. GRANT, OF POMEROY, OHIO.

ROTARY STEAM-ENGINE.

Specification of Letters Patent No. 3,360, dated December 4, 1843.

To all 'wh-0m t may concern.'

Be it known that I, ROYAL O. GRANT, of Pomeroy, in -the county of Meigs andState of Ohio, have invented a new and useful Improvement in Rotary Steam-Engines;

and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure l is a perspective View, Fig. 2 detached parts, Fig. 3 section.

The nature of my invention consists in using the slide valve in the steam chamber as a cut o, and the apparatus for transferring the steam from one engine to another.

The outside of my engine is a hollow cylinder (a) a quarter of which (b) is removable; this cylinder is placed horizontally and has a head (c) screwed onto flanges in the usual manner of steamcylinders; above this cylinder a box (d) is formed which opens into it; one side of said box being removable with the segment (5); this segment has a flange running along its lower edge, corresponding with the part it fits, on the cylinder, by which it is attached to it. Outside the heads of the cylinder a thick brace of metal (e) runs across the center, a little convex on the inside, and firmly bolt-ed `at each end; this is to spring the end in to keep it steam tight and can be screwed up at pleasure; it serves also as a bearing for the shaft (f) towork in which runs through the axis of the cylinder. On

' each side of the box (el) a small steam chest (g) is cast, which on one side admits t-he steam to the cylinder and on the other serves for the receiverrfor escape steam. The shaft on the inside of the cylinder is enlarged and from one side of it projects radially a piston or wing (7L). The edge of this is packed similar to many rotary engines now in use. In the box (el) a `valve (i) is made to slide up and down and a cover or cap (in) shuts into said box down onto a packing which surrounds thevalve and keeps it steam tight. t Two rods (Z, Z,) attached to the valve project up through this cap, and are affixed to a cross head (m), from each end of which a lifting bar is pendent, the lower end being connected with horizontal links `n having a pivot at their other end on which they turn. The lifting bars are raised at each revolution of the shaft by cams (o) on said shaft, these raise the valve to allow the wing (l1.) to pass. The valve (i) has a recess formed in its face at each side at (v7) -the same width as the induction opening, and deep enough when shut down, as shown in Fig. 3, to form a clear steam way into and from the steam cylinder'. IVhen the valve is raised, this way is cut off and the ingress and egress of steam stopped.

The escape` steam is conveyed through a pipe (p) into a valve box (q) having a horizontal partition therein, the pipe entering on the upper side of said partition through which there is a hole closed by a valve (s) on the under side; a pipe (r) also leads from the upper side of the partition for the steam to escape in the air, thisis closed 0n the inside by a vertical valve (r) that slides do-wn over the opening into it, said valvebeing attached to the side of the stem ofthe valve (s) so that when oneis opened the other is closed. From below the partition a pipe (t) leads into a cylinder which is placed on the back end o-f the furnace so that its heat may be regulated by dampers in any convenient way, by which lVhat I claim as my invention and desire to secure by Letters Patent isf l. The recess (i) in valve (i) for a steam way which cuts off the steam as the valve rises, in the manner and for the purpose described.

9.. I claim the valve box (g) and combinaV tion of, valves therein, in combination with the cylinder (t) constructed and arranged as herein set forth.

E. o. GEANT.

Vitnesses J. J. GREENOUGH, J. H. GODDARD. 

